Evaluation of a Cruciate Ligament Model: Sensitivity to the Parameters during Drawer Test Simulation

2008 ◽  
Vol 24 (3) ◽  
pp. 234-243 ◽  
Author(s):  
Luigi Bertozzi ◽  
Rita Stagni ◽  
Silvia Fantozzi ◽  
Angelo Cappello
Keyword(s):  
Elastic Modulus ◽  
Daily Living ◽  
Cruciate Ligament ◽  
Cruciate Ligaments ◽  
Full Extension ◽  
Daily Living Activities ◽  
Geometrical Properties ◽  
Reference Length ◽  
Subject Specific ◽  
Ligament Model

The knowledge of how cruciate ligaments stabilize the knee joint could be very useful during the execution of daily living activities for the development of clinical procedures. The objective of this study was to evaluate a cruciate ligament model that could achieve this knowledge while avoiding any destructive measurements in living healthy subjects. Subject-specific geometries and kinematic data, acquired from a living subject, were the foundations of the devised model. Each cruciate ligament was modeled with 25 linear-elastic elements and their geometrical properties were subject specific. The anteroposterior drawer test was simulated, and the sensitivity to the reference length and the elastic modulus was performed. Laxity, anterior, and posterior stiffness were calculated and compared with the literature. The laxity was most sensitive to reference length but fitted the literature well considering the reference length estimated from the subject. Both stiffnesses were most sensitive to elastic modulus variations. At full extension, anterior stiffness overestimated the literature, but at 90° good comparisons with the literature were obtained. Posterior stiffness showed smaller overestimations. The devised model, when properly improved, could evaluate the role of the cruciate ligaments of a living subject during the execution of daily living activities.

Shoulder Joint Motion Analysis of Daily Living Activities Using a Global Coordinate System

2013 ◽  
Vol 50 (10) ◽  
pp. 840-844
Author(s):  
Yukiya INOUE ◽  
Mayumi KIHARA ◽  
Junko YOSHIMURA ◽  
Naoki YOSHIDA ◽  
Kenji MATSUMOTO ◽  
...  
Keyword(s):  
Coordinate System ◽  
Motion Analysis ◽  
Shoulder Joint ◽  
Daily Living ◽  
Global Coordinate System ◽  
Joint Motion ◽  
Daily Living Activities

Optimal Design of a Rehabilitation Four Cable-Driven Parallel Robot for Daily Living Activities

2020 ◽  
pp. 3-12 ◽  
Author(s):  
Ferdaws Ennaiem ◽  
Abdelbadiâ Chaker ◽  
Juan Sebastián Sandoval Arévalo ◽  
Med Amine Laribi ◽  
Sami Bennour ◽  
...  
Keyword(s):  
Optimal Design ◽  
Daily Living ◽  
Parallel Robot ◽  
Daily Living Activities

Interview for Deterioration in Daily Living Activities in Dementia: construct and concurrent validity in patients with mild to moderate dementia

2011 ◽  
Vol 24 (3) ◽  
pp. 382-390 ◽  
Author(s):  
Sebastian Voigt-Radloff ◽  
Rainer Leonhart ◽  
Matthias Schützwohl ◽  
Luisa Jurjanz ◽  
Thomas Reuster ◽  
...  
Keyword(s):  
Activities Of Daily Living ◽  
Internal Consistency ◽  
Concurrent Validity ◽  
Daily Living ◽  
Factor Model ◽  
Cognitive Testing ◽  
Daily Living Activities ◽  
Moderate Dementia ◽  
Dementia Research ◽  
And Performance

ABSTRACTBackground: The purpose of the study was to translate the Interview for Deterioration in Daily Living Activities in Dementia (IDDD) into German and to evaluate the construct and concurrent validity in people with mild to moderate dementia.Methods: IDDD data of two pooled samples (n = 301) were analyzed regarding ceiling and bottom effects, internal consistency, factor reliability and correlations with corresponding scales on cognition and activities of daily living.Results: We found minimal bottom (< 5%) and ceiling (≤ 2%) effects, good internal consistency (Cronbach's α > 0.7) and moderate to good factor reliability (0.66–0.87). Low correlations with cognition (Pearson coefficient: < 0.17) confirmed the differences between cognitive testing and activities of daily living (ADL). Minor correlations with other ADL scores (r < 0.2) indicated that different scores cover a different range of ADLs. The original two factor model could not be confirmed. A suggested four factor model distinguishing initiative and performance of basic and instrumental ADL demonstrated better indices of fit and higher correlations with corresponding scales.Conclusion: A four factor model of the IDDD can be used in dementia research for assessing initiative in and performance of basic and household activities of daily living. The findings suggest that ADL scales correlate only poorly and that further development of the IDDD is needed to cover a broader range of ADLs.

scholarly journals Difficulty of Elderly SCI Subjects to Translate Motor Recovery—“Body Function”—into Daily Living Activities

2009 ◽  
Vol 26 (11) ◽  
pp. 2037-2044 ◽  
Author(s):  
Werner Jakob ◽  
Markus Wirz ◽  
Hubertus J.A. van Hedel ◽  
Volker Dietz
Keyword(s):  
Daily Living ◽  
Motor Recovery ◽  
Daily Living Activities ◽  
Body Function

A mixed reality cognitive orthosis to support older adults in achieving their daily living activities: perspective from stakeholders (Preprint)

2021 ◽  
Author(s):  
Amel Yaddaden ◽  
Guillaume Spalla ◽  
Charles Gouin-Vallerand ◽  
Patty Semeniuk ◽  
Nathalie Bier
Keyword(s):  
Older Adults ◽  
Focus Groups ◽  
Neurodegenerative Disorders ◽  
Daily Living ◽  
Mixed Reality ◽  
Daily Life ◽  
User Centered Design ◽  
Daily Living Activities ◽  
Effective Interventions ◽  
Head Mounted Displays

BACKGROUND Mixed reality is an emerging technology allowing to "blend" virtual objects in the actual user's environment. A way to realize this is by using head-mounted displays. Many recent studies have suggested the possibility of using this technology to support the cognition of people with neurodegenerative disorders. However, most studies explored improvements in cognition rather than in independence and safety during the accomplishment of daily living activities. It is therefore crucial to document the possibility of using mixed reality to support the independence of older adults in their daily life. OBJECTIVE This study is part of a larger user-centered design study of a cognitive orthosis using pure mixed reality to support independence of people living with neurodegenerative disorders (NDs). The objectives were to explore: (1) What are the main difficulties encountered by older adults with NDs in their daily life to ensure that the pure mixed reality meets their needs; (2) What are the most effective interventions with this population in order to determine what types of assistance should be given by the pure mixed reality technology; (3) How should the pure mixed reality technology provide assistance to promote safety and independence at home; and (4) What are the main facilitators and barriers for the use of this technology. METHODS We conducted a descriptive qualitative study with 5 focus groups with experts of the disease and its functional impacts (n = 29) to gather information. Qualitative data from the focus groups was analyzed through an inductive thematic analysis. RESULTS The themes emerging from the analysis will provide clear guidelines to the development team prototyping a first version of a cognitive orthosis based on pure mixed reality. CONCLUSIONS The cognitive orthosis that will be developed in the light of this study will act as a proof of concept of the possibility of supporting people with neurodegenerative disorders using pure mixed reality.

scholarly journals USE CAUTION WHEN ASSESSING PRE-OPERATIVE LEG LENGTH DISCREPANCY IN PEDIATRIC PATIENTS WITH ANTERIOR CRUCIATE LIGAMENT INJURIES

2020 ◽  
Vol 8 (4_suppl3) ◽  
pp. 2325967120S0028
Author(s):  
Lindsay M. Schlichte ◽  
Peter D. Fabricant ◽  
Christine Goodbody ◽  
Daniel W. Green
Keyword(s):  
Anterior Cruciate Ligament ◽  
Pediatric Patients ◽  
Cruciate Ligament ◽  
Weight Bearing ◽  
Acl Injury ◽  
Leg Length ◽  
Full Extension ◽  
X Ray ◽  
Length Discrepancy ◽  
Anterior Cruciate

Background: Pre- and post-operative standing hip to ankle radiography is critical for monitoring potential post-operative growth arrest and resultant length and angular deformities after pediatric anterior cruciate ligament (ACL) reconstruction. During acquisition of pre-operative standing alignment radiographs, it is possible that patients are lacking full extension, not weight bearing comfortably, or leaning resulting in inaccurate measurements. Purpose: This study aims to assess both pre- and post-operative radiographic measurements to assess if the standing pre-operative x-ray is a accurate and reliable source for baseline measurements. Methods: We retrospectively reviewed prospectively collected pre-operative and first post-operative full-length hip-to-ankle radiographs in a cohort of skeletally immature athletes who presented with an acute ACL injury and underwent subsequent surgical reconstruction. Initially, leg length discrepancy for 25 patients was measured by 3 orthopedic surgeons (top of femoral head to center of tibial plafond). The intraclass correlation was almost perfect (ICC (2,1) = .996) therefore, 1 surgeon measured the remaining 94 radiographs. Measurements for both the injured and uninjured legs were obtained for comparison and surgeons were blinded to the injured side. Results: A total of 119 pediatric patients (mean age 13.4, range 7-14 years) were included (83 males and 36 females). Patient were categorized as either having ≥5mm, ≥10mm, or ≥15mm LLD on pre-operative standing x-ray. Sixty-two patients (52%) were found to have a pre-operative LLD ≥ 5mm. Forty-one (66%) of these patients tore their ACL on the limb measuring shorter. At 6 month post-operative standing x-ray, 35 patients (56%) resolved to ≤5mm LLD. Eighteen patients had a pre-operative LLD of ≥ 10mm. At 6 month post-operative standing x-ray, 13 (72%) patients resolved to ≤5mm LLD. Five patients had a pre-operative LLD of ≥ 15mm. At 6 month post-operative standing x-ray, 4 (80%) resolved ≤5mm. All patients with a pre-operative LLD of ≥ 13mm had sustained an ACL injury on the limb measuring shorter Conclusion: Of the pediatric ACL patients initially presenting with a pre-operative LLD of ≥ 10mm, 72% demonstrated apparent correction of their LLD on their 6 month standing x-ray. This high rate of LLD pre-operatively but not post operatively calls into question the accuracy of pre-operative standing alignment radiographs for patients after an ACL tear. Surgeons and radiology technicians should be aware of injured patients potentially lacking full extension, leaning, or not weight bearing comfortably, and should consider delaying preoperative radiographic length and alignment analysis until after the patient is able to fully straighten the injured knee and weight bear comfortably.

Injury to the Anterior Cruciate Ligament during Alpine Skiing

2002 ◽  
Vol 30 (4) ◽  
pp. 537-540 ◽  
Author(s):  
Sharon L. Hame ◽  
Daniel A. Oakes ◽  
Keith L. Markolf
Keyword(s):  
Anterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
Alpine Skiing ◽  
Full Extension ◽  
Flexion Extension ◽  
Fresh Frozen ◽  
Full Flexion ◽  
The Mean ◽  
Anterior Cruciate ◽  
Knee Flexion Position

Background The anterior cruciate ligament has been shown to be particularly susceptible to injury during alpine skiing. Tibial torque is an important injury mechanism, especially when applied to a fully extended or fully flexed knee. Purpose We wanted to record the forces generated in the anterior cruciate ligament with application of tibial torque to cadaveric knees in different positions. Study Design Controlled laboratory study. Methods Thirty-seven fresh-frozen cadaveric knees were instrumented with a tibial load cell that measured resultant force in the anterior cruciate ligament while internal and external tibial torques were applied to the tibia at full extension, 90° of flexion, full flexion, and forced hyperflexion. Results At each knee flexion position, mean force generated by 10 N·m of internal tibial torque was significantly higher than the mean generated by 10 N·m of external tibial torque. Mean forces generated by tibial torque at 90° of flexion were relatively low. During flexion-extension without tibial torque applied mean forces were highest (193 N) when the knee was hyperflexed. Conclusions Application of internal tibial torque to a fully extended or fully flexed knee represents the most dangerous loading condition for injury from twisting falls during skiing. Clinical Relevance Understanding of the mechanisms of falls can be used to design better equipment and to better prevent or treat injury.

Sign in / Sign up

Export Citation Format

Share Document